Murex :: Murex (n.) A genus of marine gastropods, having rough, and frequently spinose, shells, which are often highly colored inside; the rock shells. They abound in tropical seas..

Murexan :: Murexan (n.) A complex nitrogenous substance obtained from murexide, alloxantin, and other ureids, as a white, or yellowish, crystalline which turns red on exposure to the air; -- called also uramil, dialuramide, and formerly purpuric acid..

Murexide :: Murexide (n.) A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. Formerly called also ammonium purpurate..

Murexoin :: Murexoin (n.) A complex nitrogenous compound obtained as a scarlet crystalline substance, and regarded as related to murexide..

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